Skip to main content

Full text of "US Patent 2600036: Pinking shears"

See other formats

June 10, 1952 

Filed Oct. 4, 1948 




,]une 10, 19,52 

Filed Oot. 4, 1948 




<" ;/ 

Patented June 10, 1952 


Alexander W. Wertepny and Rudolph J. Wer- 
tepny, Chicago, III., assignors of sixty per cent 
to Stanley A. Wertepny, Edward 1. Wertepny, 
and Benjamin Luscalzo, Chicago, III. 
Application October 4, 1948, Serial No. 52,736 
2 Claires. (CI. 30--268) 

This invention relates to new and novel im- 
provements in a class of shears commonly known 
as pinking shears. Prior known kinds of shears 
used in pinking have not been entirely satis- 
factory because with slight wear or incautious 
use the shears became improperly aligned so that 
operation of te shears, if not exasperating and 
inefficient, became impossible for numerous 
reasons. Several underlying causes are subse- 
quently described. 
One of the primary factors involved in the 
rendering inoperative of heretofore known types 
of pinking shears bas been te wearing of teet 
or serrations because of use. Because no, or very 
poor means have been provided in most well 
known kinds of pinking shears for aligning the 
blades, and consequently the teeth or serrated 
cutting edges, those shears would soon become 
unusable without being realigned. The realign- 
ment involved was costly, requiring precision 
One of the objects of out new and novel shears 
is to provide an adjustable tension means con- 
nected fo one of the blades or jaws of the shears 
which wfll keep the teeth in efficient cutting 
relatiouship so that the cutting plane is always 
perpendicular to the .pivotal axis. 
Another of the factors involved in the in- 
effiCiency of prior known types of pinking shears 
is the disaligning of the jaws due to the fact that 
material to be cut would accumulate hubward, 
beyond the cutting teeth. This phenomenon 
would result in malalignment of the cutting teeth 
which in turn would cause chipping or abnormal 
wear of one of the teeth. The abnormal wear 
on any of the teeth would cause a chain result, 
causing all of the teeth to eventually be useless 
in cutting. 
Another of the objects of out new and novel 
device is fo provide, on the hub portion of each 
of the blades or jaws, extensions or teeth which 
are adapted to limit the opening of the jaws 
fo thereby preclude the gathering of material 
beyond the cutting teeth. 
Another object of our invention is to provide 
a flange on each of the jaws of a pinking shears; 
precision machined teeth spaced along the longi- 
tudinal axes of the respective flanges; said teeth 
being formed of merging machined arcuate faces 
which are concentric with the pivotal axis of 
the shears; adjustable tension means for keeping 
the teeth in a cooperable alignment; and means 
for limiting the opening of the jaws to prevent 
gathering of material beyond the teeth. 
Other and further objects of out invention-will 
become apparent from the following description 
and appended claires, reference being made fo 
the drawings herein and the numerals of refer- 
ence thereon. 
On the drawings: 
Fig. 1 is a side elevation of a pair of pinking 


shears with the jaws closed, looking at the side 
which discloses the tension spring means. 
Fig. 2 is an elevation taken at right angles 
to Fig. 1. 
5 Fig. 3 is an enlarged fragmentary section with 
parts broken away and showing the pivoting 
mechanism of out pinking shears. 
Fig. 4 is an enlarged section taken substan- 
tially on the line 4--4 of Fig. 1 and showing the 
10 pivoting mechanism and te relation of the 
members utilized in limiting the opening of 
the jaws. 
Fig. 5 is an enlarged section taken substantially 
on a line §--5 of Fig. 6 showing the pivoting 
15 means and the members utilized in limiting the 
opening of the jaws, said limiting means being 
shown in abutting position and operating to keep 
the jaws from opening further. 
Fig. 6 is a fragmentary view of a side elevation 
20 showing the jaws in extreme open' position. 
Fig. 7 is a fragmentary view of a side elevation 
of the inner surface of one of the jaws showing 
the flange which bears the cutting teeth or 
25 Fig. 8 is an enlarged view of the structures in 
box 6 of Fig. ï showing how the teeth are formed. 
Referring to the drawings, numerals | | and. | 2 
designate a pair of cooperating jaws or blades 
having the usual flnger openings |3 and |4. 
30 Preferably integral with a portion of the upper 
and inner edge of jaw ||, and with a portion 
of the lower and inner edge of jaw |2, are 
preferably arcuately shaped, preferably integral 
and inwardly extending flanges |5 and |6 respec- 
35 tively which may extend the length of the jaws 
from the hub portion 27. 
The lower edge of jaw || and upper edge of 
jaw |2 are preferably curved as illustrated in 
Figs. 1 and ï. Each of the flanges |5 and |6 
40 is provided with a plurality of machined trans- 
verse serrations or teeth |7, preferably extend« 
ing the entire length of said anges. The 
teeth |7 are preferably disposed in a curved re« 
lation substantially corresponding to the curva « 
45 ture of the respective flanges |5 and |6. Each 
of the teeth is formed by two sloping and merg- 
ing arcuate faces |6 and |9. Each of the 
cuate faces |6 and |9 slopes in opposite direc « 
tions from an apex line which forms the top 
50 of the tooth |7. In cross section each of the 
teeth is substantially triangular. Each of the 
faces |6 and |9 is curved in such a manner that 
a cutting" plane is produced which is perpendic- 
ular to the pivotal axis, said faces |6 and 
55 being arcuate and machined in planes con- 
centric fo the pivotal axis of the shears. 
Each of the jaws || and |2 at the hub por- 
tion 27 thereof is provided with a precision 
drilled aperture or hole 20. The aperture 26 in 
60 each of the jaws is in alignment with the aper- 
ture in the other of the jaws. A flanged and 

recessed pivoting member 2! is preferably rigid- 
ly positioned in the aperture of one of the ]aws, 
preferably jaw J2, and is incapable of move- 
ment independent of said last jaw. Said ruera- 
ber 2! is positioned in the aperture in 
said jaw being pivotable around said pivot 
member. Pivot member 2! may be provided 
with a preferably integral jaw-engaging portion, 
cap or head 22. Pivot member 2! is provided 
with a preïerably integral annular flange 
having a bearing surïace for the jaw J. Said 
bearing member 28 is utilized as a spacer and 
provides for the normal spacing, of the jaws 
and 2. Pivot member 2! is provided with a 
threaded recess 2g which is adapted to receive 
an adjustable headed screw 24, which is adapted 
to draw the jaws J and 2 together to com- 
pensate for wear due to use. 
Preferably jaw ! is provided with a recess 
25 which may be at the hub portion 2ï. there- 
of, and which is adapted to receive one end 
of the tension means or spring 26, said recess 
providing surfaces against which said spring 
may develop its leverage. The spring 
preferably ovate in shape and is preferably 
apertured atone end thereof, and is positioned 
through said aperture around and about the 
screw 24 by which said spring is retained. 
The spring 26 is adapted to apply a tension on 
the shears to thereby aid in keeping the teeth 
|7 in a cooperable relationship and thereby pro- 
vide for a more efficient shears. The adjustable 
tensing of spring 26 is provided by scçew 24, 
against the head 26 of vhich spring 2 a.buts, 
said spring being positioned between the shears 
(jaw J) and head 28 as illustrated in Figs. 2 
and 3. 
The recess 29, as illustrated in Fig. 3, provides 
for a threading of screw 24 thereinto. Not on]y 
will a tightening of the screw 24 keep the jaws 
! ! and 2 from undesirable rocking due fo wear- 
ing of the parts, including the flange 2, but 
also it wilI increase pressure on the spring 26 
which in turn will thereby transmit the pres- 
sure to the appropriate jaw to keep saine in 
cooperable relationship with the other jaw of 
the shears. 
As illustrated in Figs. 4, 5 and 6, preferably 
each of the jaws l! and J2, at an inner por- 
tion of the hub 27 thereof, is provided with an 
inwardly extending extension 0. The exten- 
sion, lug, or cooperating member  may be 
welded, or equivalently mounted, or may be cast 
directly with its respective jaw. Cooperating 
means {} may be optiona]ly positioned but are 
adapted fo limit the opening of the jaws or 
blades ! f and 12. The limiting should be pref- 
erably at a position hot beyond the gripward 
ends of the rows of teeth or serrations 7. By 
doing this, the material fo be cut Wfll never 
gather between the blades and cause malalign- 
ment of the jaws. 
We wish it to be understood that in one 
form the teeth of each blade or jaw of out shears 
are machined in a single operation. The holes 
or apertures 2}, pivot member 2, spring 26, 
being precision ruade, will permit assembly of 
cooperating pairs of toothed jaws f! and 2 in 
cutting relationship, and will hot thereafter re- 
quire grinding of teeth to return the jaws fo 
cooperating relationship. If should be under- 
stood that the teeth  of each jaw are precision 
machined after the pivot hole Or aperture 
has been drilled. This will insure that, .after 
assembly of the jaws |f and 

will be in exact cutting, relation and will so meet. 
As many changes could be ruade in the above 
construction, and as many apparently widely dif- 
ferent embodiments of out invention vithin the 
 scope of the claires could be constructed without 
departing from .the spirit and scope thereof, it is 
intended hat all marrer contained in the ac- 
companying sPecification shall be interpreted as 
illustrative and hot in a limiting sense. 
10 We claire: 
1. In a pinking shears, a pair of blades hav- 
ing inwardly extending flanges with co- 
operating teeth, said blades having spaced mu- 
tually facing hub portions, one of said hub por- 
1 tions having a cylindrical pivot bore and also 
having an annular bearing surface about that 
end of said bore which is proximate to the other 
hub portion, a pivot member rigidly flxed fo said 
other hub portion against independent movement 
0 relative thereto and formed with an annular 
bearing surface in rotary bearing engagement 
with the annular bearing surface oï said one hub 
portion, said pivot member having an integral 
cylindricat internally threaded end portion dis- 
 posed in said bore, a headed screw threaded 
in said end portion, and a spring coniïned be- 
tween said one hub portion and the head of said 
screw, said screw being rotatable relative to said 
pivot member fo vary the spring pressure and 
$0 thereby obtain proper engagement between said 
bearing surfaces. 
2. In a pinking shears, a pair of blades having 
inwardly extending flanges formed with cooper- 
ating teeth, said blades having spaced mutually 
$ facing hub portions, said hub portions having 
axial cylindrical bores, a pivot member having 
axially spaced cylindrical portions disposed in the 
respective bores and an intermediate integral 
annular plate-like fiange whose faces extend in 
4 parallel planes normal to said axis, said pivot 
member having an integral head at the outer 
end of one of said cylindrical portions, said head 
and one face of said flange being in rivet-tight en- 
gagement with the respective outer and inner 
45 ïaces of one of said hub portions so that said 
pivot member is incapable of movement inde- 
pendent oï said one hub portion, the other cy- 
lindrical portion being internally threaded, a 
headed screw engaged in said other cylindrical 
50 end portion, and a spring under pressure between 
the screw head and the outer face of the other 
hub portion and holding the other face of said 
flange in rotary bearing engagement with the 
inner face of said other hub portion. 
The following references are of record in the 
file oï this ptent: 




Name Date 
Deichmann ......... May 17, 1887 
Henckels ........... Feb. 26, 1889 
Holtgrave .......... Jan. 22, 1907 
Bowes .............. June I, 1909 
Chapin ............ Jan. 25, 1910 
Kermsee .......... Nov. 28, 1916 
Zeidler ............. Aug. 6, 1929 
Hickok .............. Sept. 8, 193! 
Brown .............. Oct. 16, 1945 
Mitchell ............ Mat. 5, 1946 
Kethcart ............ MaL 5, 1946